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Title: Excitation and ionization of ions by electron impact. Technical progress report, September 1, 1976--May 31, 1977. [Summaries of research activities at Georgia Institute of Technology]

Abstract

This effort is devoted to experimental measurements of electron impact excitation and ionization cross sections of ions. The cross sections of interest are those of importance in the diagnostics of CTR plasmas. Current tasks include: the completion of absolute measurements of the electron impact double ionization cross sections for Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, and Tl/sup +/ ions; the development of a laboratory-size ion source of multiply-charged ions to be used in the measurement of electron impact excitation and ionization cross sections; and the completion of absolute measurements of the electron impact excitation of Li/sup +/ ions. Preliminary measurements of the electron impact double ionization cross sections of Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, and Tl/sup +/ ions were completed. Measurements were made over the range of electron energies from the respective threshold values to approximately 1000 eV. Peak cross sections were found to vary from 7.2 x 10/sup -19/ cm/sup 2/ for Na/sup +/ to 3.5 x 10/sup -17/ cm/sup 2/ for Cs/sup +/. The data were obtained with a crossed beam apparatus operating with modulated beams. A PIG-type source of multiply charged ions is undergoing final development. The source is of laboratory sizemore » and is compatible with existing collision apparatus. The previous problem with inadequate magnetic field has been solved. Spectroscopic techniques verified the production of ions of charge state C/sup 4 +/ when CO/sub 2/ was used as the source gas. Some difficulty has been encountered in extracting adequate ion currents. Also under investigation is the optimum technique for the production of metal ions with the PIG-type ion source. A list of publications is included.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Georgia Inst. of Tech., Atlanta (USA). School of Electrical Engineering
OSTI Identifier:
7086484
Report Number(s):
ORO-3027-38
TRN: 77-019815
DOE Contract Number:  
EY-76-S-05-3027
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON-ION COLLISIONS; EXCITATION; ION SOURCES; DESIGN; PLASMA DIAGNOSTICS; IONIZATION; CATIONS; CESIUM IONS; COLLIDING BEAMS; CROSS SECTIONS; ENERGY-LEVEL TRANSITIONS; EV RANGE; LITHIUM IONS; POTASSIUM IONS; RESEARCH PROGRAMS; RUBIDIUM IONS; SODIUM IONS; THALLIUM IONS; ATOMIC IONS; BEAMS; CHARGED PARTICLES; COLLISIONS; ELECTRON COLLISIONS; ENERGY RANGE; ION COLLISIONS; IONS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena; 640301 - Atomic, Molecular & Chemical Physics- Beams & their Reactions; 700102 - Fusion Energy- Plasma Research- Diagnostics

Citation Formats

Feeney, R. K., Baggett, D. W., Hughes, D. W., Rivers, G. W., and Sayle, W. E. Excitation and ionization of ions by electron impact. Technical progress report, September 1, 1976--May 31, 1977. [Summaries of research activities at Georgia Institute of Technology]. United States: N. p., 1977. Web. doi:10.2172/7086484.
Feeney, R. K., Baggett, D. W., Hughes, D. W., Rivers, G. W., & Sayle, W. E. Excitation and ionization of ions by electron impact. Technical progress report, September 1, 1976--May 31, 1977. [Summaries of research activities at Georgia Institute of Technology]. United States. doi:10.2172/7086484.
Feeney, R. K., Baggett, D. W., Hughes, D. W., Rivers, G. W., and Sayle, W. E. Tue . "Excitation and ionization of ions by electron impact. Technical progress report, September 1, 1976--May 31, 1977. [Summaries of research activities at Georgia Institute of Technology]". United States. doi:10.2172/7086484. https://www.osti.gov/servlets/purl/7086484.
@article{osti_7086484,
title = {Excitation and ionization of ions by electron impact. Technical progress report, September 1, 1976--May 31, 1977. [Summaries of research activities at Georgia Institute of Technology]},
author = {Feeney, R. K. and Baggett, D. W. and Hughes, D. W. and Rivers, G. W. and Sayle, W. E.},
abstractNote = {This effort is devoted to experimental measurements of electron impact excitation and ionization cross sections of ions. The cross sections of interest are those of importance in the diagnostics of CTR plasmas. Current tasks include: the completion of absolute measurements of the electron impact double ionization cross sections for Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, and Tl/sup +/ ions; the development of a laboratory-size ion source of multiply-charged ions to be used in the measurement of electron impact excitation and ionization cross sections; and the completion of absolute measurements of the electron impact excitation of Li/sup +/ ions. Preliminary measurements of the electron impact double ionization cross sections of Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/, and Tl/sup +/ ions were completed. Measurements were made over the range of electron energies from the respective threshold values to approximately 1000 eV. Peak cross sections were found to vary from 7.2 x 10/sup -19/ cm/sup 2/ for Na/sup +/ to 3.5 x 10/sup -17/ cm/sup 2/ for Cs/sup +/. The data were obtained with a crossed beam apparatus operating with modulated beams. A PIG-type source of multiply charged ions is undergoing final development. The source is of laboratory size and is compatible with existing collision apparatus. The previous problem with inadequate magnetic field has been solved. Spectroscopic techniques verified the production of ions of charge state C/sup 4 +/ when CO/sub 2/ was used as the source gas. Some difficulty has been encountered in extracting adequate ion currents. Also under investigation is the optimum technique for the production of metal ions with the PIG-type ion source. A list of publications is included.},
doi = {10.2172/7086484},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {5}
}